<?hh
/**
 * Copyright (c) 2014, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the "hack" directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 */

class MyClass {
  public function doStuff() {}
}

function test<T as ?MyClass>(T $arg): void {
  if ($arg !== null) {
    $arg->doStuff();
  }
}
